Rihanna has announced that Jimmy Kimmel is set to host the first annual Diamond Ball benefitting the Clara Lionel Foundation. In addition, special guest Brad Pitt will introduce Rihanna’s orchestra performance.

“It is such an honor to have Jimmy Kimmel host this event. There is no one more hilarious to make the first annual Diamond Ball an incredible night. I’m blessed by his support,” said Rihanna. “Brad Pitt is not only a phenomenal talent, but I admire him and am inspired by his philanthropic work.”

Rihanna founded the Clara Lionel Foundation (CLF) in 2012, in honor of her grandparents, Clara and Lionel Brathwaite. During the fund-raiser event, there will be footage shown of Rihanna’s visit to the Clara Brathwaite Center for Oncology and Nuclear Medicine at the Queen Elizabeth Hospital in Barbados.

Funds raised from the Diamond Ball will go into improving the center, purchasing equipment and infrastructure planning, a projected cost of $2.4 million.

The ball takes place on December 11 in Beverly Hills. Find more information at ClaraLionelFoundation.org.